Years ago I did a lot of bullet casting, but, it was pure lead for CW Rifled-Muskets and Carbines and eventually, Rev. War Flintlock Muskets.
I was good at it, but, it was a necessary chore, like cleaning black powder arms. I didn't enjoy that part of the hobby.

Cast bullets with smokeless powder rifles is a relatively new area for me. 
I enjoy shooting and reloading a lot more than the 'Alchemy' and experimentation of Advanced Bullet casting. I prefer good and easy bullets, predictable results, and known successful 'recipes'. I guess, I am just lazy.

I sure do respect the guys that tinker and shoot cast bullets well, though!